EG/Cesium-1.132/Specs/pollWhilePromise.js

import { Frozen, getTimestamp } from "@cesium/engine";

function pollWhilePromise(promise, f, options) {
  options = options ?? Frozen.EMPTY_OBJECT;

  const pollInterval = options.pollInterval ?? 1;
  const timeout = options.timeout ?? 5000;

  return new Promise(function (resolve, reject) {
    const startTimestamp = getTimestamp();
    const endTimestamp = startTimestamp + timeout;
    let resolvedOrRejected = false;

    promise
      .then(resolve)
      .catch(reject)
      .finally(() => {
        resolvedOrRejected = true;
      });

    function poller() {
      if (resolvedOrRejected) {
        return;
      }

      try {
        f();
      } catch (e) {
        reject(e);
        resolvedOrRejected = true;
        return;
      }

      if (getTimestamp() > endTimestamp) {
        reject(
          new Error(`Timeout - function did not complete within ${timeout}ms`),
        );
        resolvedOrRejected = true;
        return;
      }

      setTimeout(poller, pollInterval);
    }

    poller();
  });
}
export default pollWhilePromise;